Guys please help. due tomorrow, please don’t take advantage of points

Which math sentence can be used to determine if the triangle is a right triangle?

Find the value of x. give reasons to justify your solutions! l, m ∈ kn

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?